This document summarizes the manufacturing process of distribution transformers at Navana Electronics Limited (NEL). It discusses the key steps which include cutting and joining the core sheets, winding the low and high voltage coils, insulating and assembling the core and coils, filling the tank with oil, testing the transformer, and attaching a rating plate. The presentation recommends that NEL adopt angular core cutting and mitered jointing to reduce core losses, and install Buchholz relays to protect transformers and increase their lifetime.
Distribution Transformer Manufacturing at Navana Electronics ltd (Aliv)Md Abu Jauad Khan Aliv
This Presentation I covered at my final year (Aug, 2014) of my BSc in EEE at IUBAT. Worked as an Intern at Navana Electronics Limited for 3 months at manufacturing division and I came up with this idea.
Distribution Transformer Manufacturing at Navana Electronics ltd (Aliv)Md Abu Jauad Khan Aliv
This Presentation I covered at my final year (Aug, 2014) of my BSc in EEE at IUBAT. Worked as an Intern at Navana Electronics Limited for 3 months at manufacturing division and I came up with this idea.
This ppt describes the function of Power Transformer in a Power Generation plant. Here DPL(Durgapur Projects Limited) was our VT venue, so chose it as the Base.
Transformer vector group_test_conditionsSARAVANAN A
Test Conditions for various vector groups commonly under use are listed along with pictorial representation. Assuming the reader has sufficient exposure to transformer winding connections.
Transformer Vector Group Test conditions
YNd1, YNd11, Dyn11, YNyn0and more
Power transformer manufacturing process and testingSai Kumar
in this detailed explanation about how the transformer is manufactured and it is beeing tested with the clear description of pictures...hope you will like it
Industrial training in Transformer manufacturing companyShridhar kulkarni
field training in transformer company,Manufacturing process and problem is given.problem for formation of sludge in the oil is given and also solution is given.
We are providing info about power transformer parts and their functions. Power transformer is very useful in transmission network of higher voltage for step-up and step down.
The following topics are covered: components of power distribution systems, fuses, padmounted transformers, pole mounted transformers, vault installed transformers, transformer stations protection, transformer connections, thermometers, pressure relief devices, restricted ground faults, differential protection current transformers connections, overexcitation, inrush current, percentage differential relays, gas relays, characteristics of CTs.
This is the presentation I gave during my seventh semester of Electrical Engineering course at NIT Durgapur. It is here for you guys. Make life easier. Cheers! For more information mail me: sdey.enteract@gmail.com
This ppt describes the function of Power Transformer in a Power Generation plant. Here DPL(Durgapur Projects Limited) was our VT venue, so chose it as the Base.
Transformer vector group_test_conditionsSARAVANAN A
Test Conditions for various vector groups commonly under use are listed along with pictorial representation. Assuming the reader has sufficient exposure to transformer winding connections.
Transformer Vector Group Test conditions
YNd1, YNd11, Dyn11, YNyn0and more
Power transformer manufacturing process and testingSai Kumar
in this detailed explanation about how the transformer is manufactured and it is beeing tested with the clear description of pictures...hope you will like it
Industrial training in Transformer manufacturing companyShridhar kulkarni
field training in transformer company,Manufacturing process and problem is given.problem for formation of sludge in the oil is given and also solution is given.
We are providing info about power transformer parts and their functions. Power transformer is very useful in transmission network of higher voltage for step-up and step down.
The following topics are covered: components of power distribution systems, fuses, padmounted transformers, pole mounted transformers, vault installed transformers, transformer stations protection, transformer connections, thermometers, pressure relief devices, restricted ground faults, differential protection current transformers connections, overexcitation, inrush current, percentage differential relays, gas relays, characteristics of CTs.
This is the presentation I gave during my seventh semester of Electrical Engineering course at NIT Durgapur. It is here for you guys. Make life easier. Cheers! For more information mail me: sdey.enteract@gmail.com
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3. Contents…..
1/2/20153
Objective
Company Profile
Basic Theories
Working Principle of Transformer
Distribution Transformer
Oil immersed distribution Transformer
Manufacturing of 3-Phase Distribution Transformer
Recommendations
4. Objectives…..
1/2/20154
To apply theoretical knowledge in the practical field
To observe the manufacturing process of distribution transformer, testing
Collecting knowledge regarding distribution transformer
Developing skills and techniques relevant to our careers
8. Basic Theories….
1/2/20158
1. Transformer is an electrical device that
transfer electric power from one circuit to
another
2. It does so without a change of frequency
3. It accomplishes this by electromagnetic
induction
4. Where the two electric circuits are in
mutual inductive influence of each other
10. Distribution Transformer…..
1/2/201510
• Used for distribution of electrical energy
Generally, operates at low voltage as less than 33KV in industrial purpose
and 440v-220v in domestic purpose
Three phase distribution transformers ,widely used in 11kv distribution
line to step down the voltage level.
16. Core material…. …
1/2/201516
The mostly used core material
is CRGO-Cold Rolled Grain
Oriented steel sheets of 3% of
Silicon
Thickness of the CRGO sheets
usually 0.27 mm
Oxide coating is provided for
CRGO laminations to reduce
eddy current losses
18. 1/2/201518
Core Jointing on Channel….
This is the simplest form of joints
The flux leaves and enters at the joint in
perpendicular
19. 1/2/201519
Placing laminated sheets by hand or
hammer manually
No air gap between the joints of two
consecutive sheets
The entire assembly is done on a frame
commonly known as core channel
These frames being used as a clamping
support of the core assembly
20. Covering copper wire with Insulating Tape…..
1/2/201520
The mostly used material for
winding wires or strips is
copper .
The copper wires or strips are
wrapped by insulating tape or
DPC paper.
22. Low Voltage Windings…..
1/2/201522
Greater simplicity in fitting
cooling ducts
More even heat distribution
through the windings
Gape between two layers
Starting End
Finishing End
23. High Voltage Windings….
1/2/201523
Horizontal machine is used to prepare the
HV winding
HV windings are of layered construction
The conductors are made of more round
wires, either with an insulating paper
The insulation between the layers
consists of DPC paper
31. Placement of HV Winding:
1/2/201531
This coil is placed on LV winding
as second layer of core
First LV coil then HV coil
The gap between the LV and HV
coil is filled with runner of pressed
board
Contd.
35. Vector grouping.....
1/2/201535
The vector grouping in NEL is Dyn 11:
Delta connected HV winding
Star connected LV winding
Neutral brought out
LV is leading HV with 30° (11
o’clock)
36. Tap Changer…..
1/2/201536
Tapping is terminated just
bellow oil level
External handle
Taping is done on HV winding
Used to regulate the output
voltage to required levels
Tap Changer
External Handle
38. Moisture Control…..
1/2/201538
The whole active part of the transformer
in the heat chamber
Keeping it there for 72 to 96 houres with
a continuous heating temperature of
100° - 141° C to clean the moistures in it
Bringing it out after getting proper
insulation
42. Inserting The Active Part Into The Tank…..
1/2/201542
Whole active part is covered by
press board
Crane is used to lift the active part
By handling a chain the active part
is put slowly in the tank
43. Bushings….
1/2/201543
Counteracting the electrical field
strength
Insulating the incoming or outgoing
conductor into or out of the transformer
tank
Conductor
Insulator
44. Conservator….
1/2/201544
Providing adequate space for
expansion of oil inside the tank
It also acts as a reservoir for the
insulating oil.
The oil level indicator indicates the
oil level
Oil level should not fall below
minimum limit
46. Function of Transformer Oil….
1/2/201546
Providing dielectric strength
to the insulation system
Providing efficient cooling
Protecting of the transformer
core and coil from chemical
attack
46
47. QC Tests….
1/2/201547
Testing of Distribution Transformer:
Insulation test
Ratio test
Open circuit test
Short circuit test
51. Recommendation…..
1/2/201551
NEL should cut the core sheets as angular core cutting and arrange
the core sheets by mitered joint system to reduce core loss.
The transformer manufactured by NEL should always use Buchholz
Relay that protects the transformer all the time and increase its life
time.
52. Contd.
1/2/201552
Elaboration of My Recommendations:
In Mitered core joints the flux
goes by an angle 450 .
That is very smooth path for the
flux
Cross grain loss is minimum and
core loss will be reduced
If any fault occurs in
transformer buchholz rely
gives alarm and can protect the
transformer
